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United States Patent | 5,666,852 |
Musschoot | September 16, 1997 |
A counterweight is freely pivoted on a rotatably driven unbalanced eccentric weight member such that at start up the counterweight does not add materially to the unbalance created by the eccentric weight member and such that as the motor attains operating speed the freely pivoted counterweight is slung outward relative to the eccentric weight member thus adding unbalance to the eccentric weight member and increasing the vibratory forces generated by the apparatus.
Inventors: | Musschoot; Albert (Barrington, IL) |
Assignee: | General Kinematics Corporation (Barrington, IL) |
Appl. No.: | 387349 |
Filed: | February 13, 1995 |
Current U.S. Class: | 74/87; 74/61; 198/770; 209/366.5; 366/128 |
Intern'l Class: | F16H 033/14 |
Field of Search: | 74/61,87,84 R,84 S 198/770 209/366.5,367,325,326,332 366/128 404/117 |
2418982 | Apr., 1947 | O'Connor | 74/87. |
2636719 | Apr., 1953 | O'Connor | 198/770. |
3407670 | Oct., 1968 | Venanzetti | 366/128. |
4025419 | May., 1977 | Musschoot | 209/3. |
4580456 | Apr., 1986 | Takano | 366/128. |
Marks' Standard Handbook for Mechanical Engineers, 8th Ed., .COPYRGT.1978, pp. 5-72, Figures 11 & 12. |